将MKAnnotation坐标转换为查看坐标

Question

我在用户单击引脚（如Zillow应用程序）时显示自定义UIView。现在问题是我需要将视图放在实际引脚的上方。 MKAnnotationView坐标系与地图有关。我怎样才能获得关于iPhone屏幕的坐标，然后将我的视图放在该坐标上。

- (void)mapView:(MKMapView *)mv didSelectAnnotationView:(MKAnnotationView *)view 
{ 
    // get view from storyboard 
    ZillowSearchResultAnnotation *annotation = (ZillowSearchResultAnnotation *) view.annotation; 

    PropertyAbstractViewController *propertyAbstractViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PropertyAbstractIdentifier"]; 
    propertyAbstractViewController.view.frame = CGRectMake(0, 0, 100, 100); 

    [propertyAbstractViewController bind:annotation.data]; 

    [mv addSubview:propertyAbstractViewController.view]; 

} 

Answer 1

使用convertCoordinate:toPointToView:。例如：

UIView *view = ... 
CGPoint p = [mv convertCoordinate:annotation.coordinate toPointToView:mv]; 
CGRect frame = CGRectMake(p.x,p.y,view.frame.size.width,view.frame.size.height); 
view.frame = frame; 
[self.view addSubView:view]; 

Answer 2

这是完美的，但有一个小问题。如果您在Pin上使用了不同的图像，则需要对您的视图进行更正指定到您的图钉中心。 像这样

UIView *view = ... 
CGPoint p = [mv convertCoordinate:annotation.coordinate toPointToView:mv]; 
CGRect frame = CGRectMake(p.x - (view.frame.size.width/2), 
          p.y- (view.frame.size.height/2), 
          view.frame.size.width, 
          view.frame.size.height); 
view.frame = frame; 
[self.view addSubView:view];